Nanometer calcium oxide and application thereof
A nano-calcium oxide, calcium oxide technology, applied in the direction of nanotechnology, nanotechnology, calcium/strontium/barium oxide/hydroxide, etc., can solve problems such as limited literature and data, achieve simple preparation method, uniform product particles, Easy-to-control effects
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Embodiment 1
[0028] Preparation of nano calcium oxide: 0.1 mol / L Ca(OCH 2 CH 3 ) 2 Add 100ml of glycerol solution into a three-neck round-bottomed flask, add dropwise 250ml of 0.08 mol / L sodium hydroxide methanol solution into the flask in an ice-water bath at 0°C, and after the dropwise addition is completed within 30 minutes, stir and react at 0°C for 30 minutes. A transparent sol was obtained. Add 50ml of distilled water to the obtained sol, let it age at room temperature (25°C) for 3 hours, centrifuge, take the precipitate and wash it several times with distilled water, remove the washing solution, freeze-dry at -50°C for 3 hours, and obtain the calcium oxide precursor. The above-mentioned calcium oxide precursor was heated up to 550 °C at a rate of 5 °C / min, and calcined for 5 hours under reduced pressure and nitrogen protection to obtain 0.52 g of nano-calcium oxide with a particle size of 15-20 nm. TEM see figure 1 Shown, X-ray diffractogram see figure 2 shown.
[0029] Nano-...
Embodiment 2
[0031] Preparation of nano calcium oxide: 0.1 mol / L Ca(OCH 2 CH 3 ) 2 Add 80ml of glycerol solution into the reactor, add dropwise 190ml of 0.08 mol / L sodium hydroxide methanol solution into the reactor in an ice-water bath at 0°C, and after the dropwise addition is completed within 30 minutes, stir and react at 0°C for 30 minutes to obtain a transparent sol . Add 40ml of distilled water to the obtained sol, let it stand and age at room temperature for 3 hours, centrifuge, take the precipitate and wash it several times with distilled water, freeze-dry at -50°C for 3 hours to obtain the calcium oxide precursor. The above-mentioned calcium oxide precursor was heated up to 550 °C at a rate of 5 °C / min, and calcined for 10 hours under reduced pressure and nitrogen protection to obtain 0.43 g of nano-calcium oxide with a particle size of 130-150 nm.
[0032] Nano-calcium oxide antiseptic research: the above-mentioned nano-calcium oxide and bacterial suspension (10 6 CFU / mL) wa...
Embodiment 3
[0034] Preparation of nano calcium oxide: 0.15 mol / L Ca(OCH 3 ) 2 Add 100ml of propylene glycol solution into the reactor, add dropwise 300ml of 0.10 mol / L sodium hydroxide methanol solution into the reactor in an ice-water bath at 0°C, and stir and react at 0°C for 30 minutes to obtain a transparent sol. Add 50ml of distilled water to the obtained sol, let it stand and age at room temperature for 3 hours, centrifuge, take the precipitate and wash it several times with distilled water, and freeze-dry at -50°C for 3 hours to obtain the calcium oxide precursor. The above-mentioned calcium oxide precursor was heated up to 650 °C at a rate of 5 °C / min, and calcined for 5 hours under the protection of helium under reduced pressure to obtain 0.80 g of nano-calcium oxide with a particle size of 50 nm.
[0035] Nano-calcium oxide antiseptic research: the above-mentioned nano-calcium oxide and bacterial suspension (10 6 CFU / mL) was added to the orange juice, in the orange juice, the...
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